Definition: the lowest stone in an arch -- from which it springs
Similar words: stone
Definition: building material consisting of a piece of rock hewn in a definite shape for a special purpose
Usage: he wanted a special stone to mark the site
Synonyms: impost, custom, customs, customs duty
Definition: money collected under a tariff
Definition: a government tax on imports or exports
Usage: they signed a treaty to lower duties on trade between their countries